<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Primise 封装 - then方法完善与优化</title>
    <script src="./promise.js"></script>
</head>
<body>
    <script>
        let p =new Promise((resolve,reject)=>{
                resolve('ok');
                // reject('ERR');
        });
 
        const res = p.then(value=>{
            console.log(value);
            // throw 'err';
        },reason=>{
            console.warn(reason)
        });
        console.log(res)
        
        
        
    </script>
    
</body>
</html>